java.lang.IllegalArgumentException: Illegal replacement
   at java.nio.charset.CharsetEncoder.replaceWith(CharsetEncoder.java:285)
   at org.netbeans.api.queries.FileEncodingQuery$ProxyCharset$ProxyEncoder.encodeHead(FileEncodingQuery.java:397)
   at org.netbeans.api.queries.FileEncodingQuery$ProxyCharset$ProxyEncoder.implFlush(FileEncodingQuery.java:445)
   at java.nio.charset.CharsetEncoder.flush(CharsetEncoder.java:650)
   at sun.nio.cs.StreamEncoder.implClose(StreamEncoder.java:304)
   at sun.nio.cs.StreamEncoder.close(StreamEncoder.java:149)
   at java.io.OutputStreamWriter.close(OutputStreamWriter.java:233)
   at org.openide.text.DataEditorSupport.saveFromKitToStream(DataEditorSupport.java:573)
   at org.openide.text.CloneableEditorSupport$3.run(CloneableEditorSupport.java:695)
   at org.netbeans.modules.editor.lib.BeforeSaveTasks$TaskRunnable$1.run(BeforeSaveTasks.java:190)
   at org.netbeans.editor.GuardedDocument.runAtomicAsUser(GuardedDocument.java:351)
   at org.netbeans.modules.editor.lib.BeforeSaveTasks$TaskRunnable.run(BeforeSaveTasks.java:156)
   at org.netbeans.modules.editor.lib.TrailingWhitespaceRemove.runLocked(TrailingWhitespaceRemove.java:102)
   at org.netbeans.modules.editor.lib.BeforeSaveTasks$TaskRunnable.run(BeforeSaveTasks.java:153)
   at org.netbeans.modules.editor.impl.ReformatBeforeSaveTask.runLocked(ReformatBeforeSaveTask.java:124)
   at org.netbeans.modules.editor.lib.BeforeSaveTasks$TaskRunnable.run(BeforeSaveTasks.java:153)
   at org.netbeans.modules.editor.lib.BeforeSaveTasks.runTasks(BeforeSaveTasks.java:130)
   at org.netbeans.modules.editor.lib.BeforeSaveTasks$2.run(BeforeSaveTasks.java:111)
   at org.openide.text.CloneableEditorSupport.saveDocument(CloneableEditorSupport.java:732)
   at org.openide.text.DataEditorSupport.superSaveDoc(DataEditorSupport.java:605)
   at org.openide.text.DataEditorSupport$SaveImpl.run(DataEditorSupport.java:1360)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:609)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:419)
   at org.openide.text.DataEditorSupport.saveDocument(DataEditorSupport.java:601)
   at org.netbeans.modules.maven.grammar.POMDataObject$POMDataEditor$1.save(POMDataObject.java:135)
   at org.openide.actions.SaveAction.performAction(SaveAction.java:132)
   at org.openide.actions.SaveAction.performAction(SaveAction.java:102)
   at org.openide.actions.SaveAction$Delegate.actionPerformed(SaveAction.java:249)
   at org.openide.awt.ContextAction$Performer.actionPerformed(ContextAction.java:231)
   at org.openide.awt.ContextManager.actionPerformed(ContextManager.java:257)
   at org.openide.awt.ContextAction.actionPerformed(ContextAction.java:109)
   at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:93)
   at org.openide.util.actions.ActionInvoker$ActionRunnable.actionPerformed(ActionInvoker.java:162)
   at org.netbeans.core.ModuleActions.invokeAction(ModuleActions.java:109)
   at org.netbeans.modules.openide.actions.ActionsBridgeImpl.invokeAction(ActionsBridgeImpl.java:60)
   at org.openide.util.actions.ActionInvoker$ActionRunnable.doRun(ActionInvoker.java:153)
   at org.openide.util.actions.ActionInvoker$2.run(ActionInvoker.java:110)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)